In this video it takes this guy 20 strikes with what amounts to a jack hammer to get it out of the slide. With the noise that that thing was making, I don't see how he kept from tearing & bending the slide all to pieces !!! If it took him 20 strikes with that tool to do that, is it possible to remove one of these sights with a normal old hammer and a good punch ?

XD sights can be a bear. We Kroil the hell of them and use a specific sight-pushing tool. There are DIY-ers who end up using a Dremel and cutting the front sight in half and knocking the pieces out with a punch.

I removed a rear sight on a XD today that I have no idea how they even got it in. I have to heat it with a micro oxy torch and beat it like it killed the family dog. When it finally slid out it flew across the shop at about 1300 fps.